55 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of KalyaniIN18 papers
- Jadavpur UniversityIN9 papers
- Bankura UniversityIN3 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di NapoliIT3 papers
- Murshidabad Medical College and HospitalIN3 papers
- University of Naples Federico IIIT3 papers
- Astronomical Observatory of CapodimonteIT1 paper
- Universiti Tunku Abdul RahmanMY1 paper
- Universiti Tunku Abdul Rahman Sungai Long CampusMY1 paper
- University of TabrizIR1 paper
37 papers
Probing symmetric teleparallel gravity in the early universe
Avik De, Dalia Saha, Ganesh Subramaniam +1
General theory of relativity can be equivalently formulated on a flat space-time associating a torsion-free affine connection of non-vanishing non-metricity scalar . In this pap…
The issue of Branched Hamiltonian in F(T) Teleparallel Gravity
Manas Chakrabortty, Kaushik Sarkar, Abhik Kumar Sanyal
As in the case of Lanczos-Lovelock gravity, the main advantage of F(T) gravity is said to be that it leads to second order field equations, while F(R) gravity theory leads to fourt…
Bianchi Type-II Cosmological Model with Viscous Fluid
A. Banerjee, S. B. Duttachoudhury, Abhik Kumar Sanyal
A spatially homogeneous and locally rotationally symmetric Bianchi type-II cosmological model under the influence of both shear and bulk viscosity has been studied. Exact solutions…
New conserved tensors and Brans-Dicke type field equation, using integrability condition
Abhik Kumar Sanyal, Bijan Modak, Manas Chakrabortty
We explore some new off-shell and on-shell conserved quantities for a scalar field in Minkowski space, using integrability condition. The off-shell conserved tensors are related to…
Probing the early universe with a generalized action
Ranajit Mandal, Dalia Saha, Mohosin Alam +1
Possibly, the most general action in the background of isotropic and homogeneous space-time has been considered to study the quantum evolution of the early universe, apart from a c…
Some aspects of modified theory of gravity in Palatini formalism unveiled
Manas Chakrabortty, Nayem Sk, Abhik Kumar Sanyal
Under conformal transformation, f(R) theory of gravity in Palatini formalism leads to a Brans-Dicke type of scalar-tensor equivalent theory with a wrong sign in the effective kinet…
Degenerate Hamiltonian operator in higher-order canonical gravity -- the problem and a remedy
Abhik Kumar Sanyal
Different routes towards the canonical formulation of a classical theory result in different canonically equivalent Hamiltonians, while their quantum counterparts are related throu…
Early Universe with modified scalar-tensor theory of gravity
Ranajit Mandal, Chandramouli Sarkar, Abhik Kumar Sanyal
Scalar-tensor theory of gravity with non-minimal coupling is a fairly good candidate for dark energy, required to explain late-time cosmic evolution. Here we study the very early s…
Equivalent and inequivalent canonical structures of higher order theories of gravity
Ranajit Mandal, Abhik Kumar Sanyal
Canonical formulation of higher order theory of gravity can only be accomplished associating additional degrees of freedom, which are extrinsic curvature tensor. Consequently, to m…
Thermodynamics of irreversible particle creation phenomena and its cosmological consequence
Abhik Kumar Sanyal, Subhra Debnath
The study of particle creation phenomena at the expense of the gravitational field is of great research interest. It might solve the cosmological puzzle single-handedly, without th…
On the equivalence between different canonical forms of F(R) theory of gravity
Nayem Sk., Abhik Kumar Sanyal
Classical equivalence between Jordan's and Einstein's frame counterparts of F(R) theory of gravity has recently been questioned, since the two produce different Noether symmetries,…
Unified cosmology with Non-minimally coupled scalar-tensor theory of gravity
Behzad Tajahmad, Abhik Kumar Sanyal
Unlike Noether symmetry, a metric independent general conserved current exits for non-minimally coupled scalar-tensor theory of gravity, if the trace of the energy momentum tensor…
Why scalar-tensor equivalent theories are not physically equivalent?
Nayem Sk., Abhik Kumar Sanyal
Whether Jordan's and Einstein's frame descriptions of F(R) theory of gravity are physically equivalent, is a long standing debate. However, practically none questioned on true math…
History of cosmic evolution with modified Gauss-Bonnet-dilatonic coupled term
Subhra Debnath, Soumendra Nath Ruz, Ranajit Mandal +1
Gauss-Bonnet-dilatonic coupling in four dimension plays an important role to explain late time cosmic evolution. However, this term is an outcome of low energy string effective act…
Validating variational principle for higher order theory of gravity
Soumendranath Ruz, Kaushik Sarkar, Nayem Sk +1
Metric variation of higher order theory of gravity requires to fix the Ricci scalar in addition to the metric tensor at the boundary. Fixing Ricci scalar at the boundary implies th…
Resolving the issue of branched Hamiltonian in modified Lanczos-Lovelock gravity
Soumendranath Ruz, Ranajit Mandal, Subhra Debnath +1
The Hamiltonian constraint Hc = NH = 0, defines a diffeomorphic structure on spatial manifolds by the lapse function N in general theory of relativity. However, it is not manifest…
Field independent cosmic evolution
Nayem Sk., Abhik Kumar Sanyal
It has been shown earlier that Noether symmetry does not admit a form of F(R) corresponding to an action in which F(R) is coupled to scalar-tensor action for gravity or even for pu…
Euclidean wormholes with minimally coupled scalar fields
Soumendranath Ruz, Subhra Debnath, Abhik Kumar Sanyal +1
A detailed study of quantum and semiclassical Euclidean wormholes for Einstein's theory with a minimally coupled scalar field has been performed for a class of potentials. Massless…
Revisiting Noether gauge symmetry for F(R) theory of gravity
Nayem Sk., Abhik Kumar Sanyal
Noether gauge symmetry for F(R) theory of gravity has been explored recently. The fallacy is that, even after setting gauge to vanish, the form of F(R) \propto R^n (where n \neq 1,…
Viability of Noether symmetry of F(R) theory of gravity
Kaushik Sarkar, Nayem Sk., Subhra Debnath +1
Canonization of F(R) theory of gravity to explore Noether symmetry is performed treating R - 6(\frac{\ddot a}{a} + \frac{\dot a^2}{a^2} + \frac{k}{a^2}) = 0 as a constraint of the…
Why Noether symmetry of F(R) theory yields three-half power law?
Kaushik Sarkar, Nayem Sk., Soumendranath Ruz +2
Noether symmetry of F(R) theory of gravity in vacuum or in matter dominated era yields three-half power law of R. We show that this particular curvature invariant term is very spec…
Canonical formulation of curvature squared action in the presence of lapse function
Abhik Kumar Sanyal, Subhra Debnath, Soumendranath Ruz
Lapse function appears as Lagrange multiplier in Einstein-Hilbert action and its variation leads to the (0 0) equation of Einstein, which corresponds to the Hamiltonian constraint…
Noether symmetry for Gauss-Bonnet dilatonic gravity
Abhik Kumar Sanyal, Claudio Rubano, Ester Piedipalumbo
Noether symmetry for Gauss-Bonnet-Dilatonic interaction exists for a constant dilatonic scalar potential and a linear functional dependence of the coupling parameter on the scalar…
Can particle creation phenomena replace dark energy?
Subhra Debnath, Abhik Kumar Sanyal
Particle creation at the expense of gravitational field might be sufficient to explain the cosmic evolution history, without the need of dark energy at all. This phenomena has been…